Improve top-level Makefile rules

Use automake's '+=' to simplify include_HEADERS rules.  Move most
EXTRA_DIST files to noinst_HEADERS, eliminating duplication of headers
listed by include_HEADERS.  Add MIPS and PPC32 headers that were not
being distributed previously.

Signed-off-by: Zachary T Welch <zwelch@codesourcery.com>
1 file changed